Pearl Beach is an unincorporated community located in St. Clair County, Michigan. It is a Census-designated place (CDP) used for statistical purposes. As of the 2000 census, the community had a total population of 3,224.
The CDP includes both Pearl Beach and Pointe aux Tremble, another unincorporated community just east of Pearl Beach. The CDP consists of a narrow strip along the north side of the North Channel of the St. Clair River from the western border of Algonac to the easternmost point of land where the North Channel flows into Anchor Bay.
Michigan State Highway 29 runs through the area, following the contour of the North Channel.
According to the United States Census Bureau, the community has a total area of 8.0 km2 (3.1 mi2). 5.5 km2 (2.1 mi2) of it is land and 2.5 km2 (0.9 mi2) of it is water. The total area is 30.84% water.